/* 
  EEPROM.cpp - RPI2040 EEPROM emulation

  Copyright (c) 2014 Ivan Grokhotkov. All rights reserved.
  This file is part of the esp8266 core for Arduino environment.
 
  This library is free software; you can redistribute it and/or
  modify it under the terms of the GNU Lesser General Public
  License as published by the Free Software Foundation; either
  version 2.1 of the License, or (at your option) any later version.

  This library is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  Lesser General Public License for more details.

  You should have received a copy of the GNU Lesser General Public
  License along with this library; if not, write to the Free Software
  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
*/

#ifndef EEPROM_h
#define EEPROM_h

#include <stddef.h>
#include <stdint.h>
#include <string.h>

class EEPROMClass
{
public:
  EEPROMClass(void);

  void begin(size_t size);
  uint8_t read(int const address);
  void write(int const address, uint8_t const val);
  bool commit();
  bool end();

  uint8_t *getDataPtr();
  uint8_t const *getConstDataPtr() const;

  template <typename T>
  T &get(int const address, T &t)
  {
    if (address < 0 || address + sizeof(T) > _size)
      return t;

    memcpy((uint8_t *)&t, _data + address, sizeof(T));
    return t;
  }

  template <typename T>
  const T &put(int const address, const T &t)
  {
    if (address < 0 || address + sizeof(T) > _size)
      return t;
    if (memcmp(_data + address, (const uint8_t *)&t, sizeof(T)) != 0)
    {
      _dirty = true;
      memcpy(_data + address, (const uint8_t *)&t, sizeof(T));
    }

    return t;
  }

  size_t length() { return _size; }

  uint8_t &operator[](int const address) { return getDataPtr()[address]; }
  uint8_t const &operator[](int const address) const { return getConstDataPtr()[address]; }

protected:
  uint8_t *_sector;
  uint8_t *_data = nullptr;
  size_t _size = 0;
  bool _dirty = false;
};

extern EEPROMClass EEPROM;

#endif
